651645591552 has 336 divisors, whose sum is σ = 1970624829888. Its totient is φ = 207099002880.

The previous prime is 651645591521. The next prime is 651645591593. The reversal of 651645591552 is 255195546156.

651645591552 is a `hidden beast` number, since 6 + 5 + 1 + 6 + 45 + 591 + 5 + 5 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 968269488 + ... + 968270160.

Almost surely, 2^651645591552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651645591552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985312414944).

651645591552 is an abundant number, since it is smaller than the sum of its proper divisors (1318979238336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651645591552 is a wasteful number, since it uses less digits than its factorization.

651645591552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299 (or 1272 counting only the distinct ones).

The product of its digits is 8100000, while the sum is 54.

The spelling of 651645591552 in words is "six hundred fifty-one billion, six hundred forty-five million, five hundred ninety-one thousand, five hundred fifty-two".